<template>
  <div class="comment-container">
    <h3>发表评论</h3>
    <hr />
    <textarea placeholder="请输入评论内容...(最多120字)" maxlength="120" v-model="msg"></textarea>
    <mt-button type="primary" size="large" @click="postComment">发表评论</mt-button>
    <div class="cmt-list">
      <div class="cmt-item" v-for="(item,i) in comments" :key="item.i">
        <div
          class="cmt-title"
        >第{{ i+1 }}楼&nbsp;&nbsp;用户:{{ item.user_name }}&nbsp;&nbsp;发表时间: {{ item.add_time | dataFormat }}</div>
        <div class="cmt-body">{{ item.content === "" ? "无评论内容": item.content }}</div>
      </div>
    </div>
    <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>
  </div>
</template>

<script>
import { Toast } from "mint-ui";
export default {
  data() {
    return {
      pageIndex: 1, //默认展示第一页数据
      comments: [], //所有的评论数据
      msg: "" //评论输入的内容
    };
  },
  created() {
    this.getComments();
  },
  methods: {
    getComments() {
      this.$http
        .get("api/getcomments/" + this.id + "?pageindex=" + this.pageIndex)
        .then(result => {
          if (result.body.status === 0) {
            // this.comments = result.body.message;
            this.comments = this.comments.concat(result.body.message);
          } else {
            Toast("获取评论数据失败!");
          }
        });
    },
    getMore() {
      this.pageIndex++;
      this.getComments();
    },
    postComment() {
      // 校验是否为空
      if (this.msg.trim().length === 0) {
        return Toast("评论内容不能为空!");
      }
      // 发表评论
      // 参数1: 请求的URL地址
      // 参数2: 提交给服务器的数据对象 { content: this.msg}
      // 参数3: 定义提交时候,表单中数据的格式 { emulateJSON:true } application/x-www-form-urlencoded
      this.$http
        .post("api/postcomment/" + this.$route.params.id, {
          content: this.msg.trim()
        })
        .then(function(result) {
          if (result.body.status === 0) {
            // 1.拼接处一个评论对象
            var cmt = {
              user_name: "匿名用户",
              add_time: Date.now(),
              content: this.msg.trim()
            };
            this.comments.unshift(cmt);
            this.msg = "";
          }
        });
    }
  },
  props: ["id"]
};
</script>

<style lang="scss" scoped>
.comment-container {
  h3 {
    font-size: 18px;
  }
  textarea {
    margin-bottom: 0;
    font-size: 13px;
    height: 85px;
  }
  .cmt-list {
    margin: 10px 5px;
    font-size: 13px;
    .cmt-item {
      .cmt-title {
        border-radius: 5px;
        padding-left: 1em;
        background-color: #ccc;
        line-height: 30px;
      }
      .cmt-body {
        line-height: 35px;
        text-indent: 2em;
      }
    }
  }
}
</style>